Climatological Report (Monthly)
Issued by NWS Billings, MT

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CXUS55 KBYZ 011112
CLMBIL


CLIMATE REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
509 AM MDT MON JUN 1 2015

...................................

...THE BILLINGS MT CLIMATE SUMMARY FOR THE MONTH OF MAY 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1934 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
HIGHEST            83   05/31
LOWEST             31   05/11
AVG. MAXIMUM     63.9              67.5    -3.6
AVG. MINIMUM     43.7              43.6     0.1
MEAN             53.8              55.6    -1.8
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      1
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
TOTALS           2.43              2.18    0.25
DAYS >= .01        13
DAYS >= .10         8
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.83   05/15 TO 05/16

SNOWFALL (INCHES)
TOTALS              T               2.0    -2.0
SINCE 7/1        55.4              55.0     0.4
SNOWDEPTH AVG.      0
DAYS >= TRACE       1
DAYS >= 1.0         0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T   05/10 TO 05/10

DEGREE_DAYS
HEATING TOTAL     344               309      35
 SINCE 7/1       6051              6686    -635
COOLING TOTAL       3                16     -13
 SINCE 1/1          3                17     -14
.................................................

WIND (MPH)
AVERAGE WIND SPEED              9.0
HIGHEST WIND SPEED/DIRECTION    38/310    DATE  05/31
HIGHEST GUST SPEED/DIRECTION    47/310    DATE  05/31

AVERAGE RH (PERCENT)     63

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              8     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       4
LIGHT RAIN               18     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       1
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      13     FOG W/VIS <= 1/4 MILE      2
HAZE                      1

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

&&

...MAY 2015 MONTH IN REVIEW FOR BILLINGS...

BELOW IS A SUMMARY OF THE TEMPERATURE...PRECIPITATION...AND WIND
STATISTICS FOR BILLINGS FOR MAY 2015. ALL TEMPERATURES ARE IN
DEGREES FAHRENHEIT AND ALL PRECIPITATION AMOUNTS ARE IN INCHES. NORMALS
ARE 30 YEAR AVERAGES CALCULATED FROM 1981 TO 2010. MONTHLY RANKINGS
FOR PRECIPITATION...SNOWFALL...AND TEMPERATURES USE A PERIOD OF RECORD
THAT STARTED IN AUGUST 1934 AT THE BILLINGS AIRPORT. MONTHLY RANKINGS
FOR WIND USE A PERIOD OF RECORD THAT STARTED IN 1984.

NUMBERS DENOTED WITH AN * IS MISSING DATA IN THE CALCULATION.

...BILLINGS MONTHLY PRECIPITATION...

 MONTH   2015 VALUES  NORMALS    DEPARTURE  RANKING

MAY          2.43     2.18       +0.25      27TH WETTEST OUT OF 81 YEARS
                                            (RECORD WETTEST WAS 9.54 IN 2011)
                                            (WETTEST SINCE 4.28 IN 2013)

...BILLINGS MAY 2015 BROKEN OR TIED DAILY PRECIPITATION RECORDS...

NONE

...BILLINGS MONTHLY SNOWFALL...

 MONTH   2015 VALUES  NORMALS    DEPARTURE  RANKING

MAY             T       2.0       -2.0      TIED FOR THE 20TH LEAST SNOWIEST OUT OF 81 YEARS
                                            (RECORD LEAST SNOWIEST WAS 0.0 TIED IN 1993)
                                            (LEAST SNOWIEST SINCE T IN 2013)

...BILLINGS MAY 2015 BROKEN OR TIED DAILY SNOWFALL RECORDS...

NONE

...BILLINGS AVERAGE TEMPERATURES...

 MONTH   2015 VALUES  NORMALS   DEPARTURE  RANKING

MAY          53.8      55.6      -1.8      TIED FOR THE 25TH COLDEST OUT OF 81 YEARS
                                           (RECORD COLDEST WAS 49.9 IN 1950)
                                           (COLDEST SINCE 50.0 IN 2011)

...BILLINGS AVERAGE HIGH TEMPERATURES...

 MONTH   2015 VALUES  NORMALS   DEPARTURE  RANKING

MAY          63.9      67.5      -3.6      21ST COLDEST OUT OF 81 YEARS
                                           (RECORD COLDEST WAS 58.4 IN 2011)
                                           (COLDEST SINCE 58.4 IN 2011)

...BILLINGS MAY 2015 BROKEN OR TIED WARMEST DAILY HIGH TEMPERATURE RECORDS...

NONE

...BILLINGS MAY 2015 BROKEN OR TIED COLDEST DAILY HIGH TEMPERATURE RECORDS...

NONE

...BILLINGS AVERAGE LOW TEMPERATURES...

 MONTH   2015 VALUES  NORMALS   DEPARTURE  RANKING

MAY          43.7      43.6      +0.1      TIED FOR THE 38TH WARMEST OUT OF 81 YEARS
                                           (RECORD WARMEST WAS 49.7 IN 1958)
                                           (WARMEST SINCE 44.8 IN 2014)

...BILLINGS MAY 2015 BROKEN OR TIED WARMEST DAILY LOW TEMPERATURE RECORDS...

NONE

...BILLINGS MAY 2015 BROKEN OR TIED COLDEST DAILY LOW TEMPERATURE RECORDS...

NONE

...BILLINGS MONTHLY WIND AVERAGES...

 MONTH   2015 VALUES  NORMALS    DEPARTURE  RANKING

MAY           9.0       9.9       -0.9      TIED FOR THE 3RD LEAST WINDIEST OUT OF 66 YEARS
                                            (RECORD LEAST WINDIEST WAS 8.6 IN 1991)
                                            (LEAST WINDIEST SINCE 8.8 IN 2014)

$$



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